Laser scanner

A laser scanner comprising:

• a distance measuring unit which has a light emitting element for emitting a distance measuring light, a distance measuring light projecting unit for projecting said distance measuring light, a light receiving unit for receiving a reflected distance measuring light and a photodetector for receiving said reflected distance measuring light and producing alight receiving signal, and which performs a distance measurement of an object to be measured based on said light receiving signal from said photodetector,
• an optical axis deflecting unit provided on a distance measuring optical axis and for deflecting said distance measuring optical axis, a projecting direction detecting unit for detecting a deflection angle of said distance measuring optical axis, and
• a control component for controlling a deflecting operation of said optical axis deflecting unit and a distance measuring operation of said distance measuring unit,
• wherein said optical axis deflecting unit comprises a pair of optical prisms capable of rotating with said distance measuring optical axis as a center and motors which individually and independently rotate said optical prisms,
• and wherein said control component is configured to control a deflection by said optical axis deflecting unit by controlling rotating directions, rotating speeds, and a rotation ratio of said pair of optical prisms, scan said distance measuring light within a measurement range as set, and acquire scanning data under scanning conditions corresponding to said measurement range, and
• wherein a local measurement range is set within the measurement range, said control component individually rotates said two optical prisms in predetermined deflection angle ranges, integrally rotates said two optical prisms at a predetermined angle, and performs a local scanning within said local measurement range.